how to use MWG Tags - Githubissues

I am trying to embed MWG tags in XMP. I do not know how to access the child elements of XML(RDF) and attribute. Please tell me if there is any way.

http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf

exempi.register_namespace("http://www.metadataworkinggroup.com/schemas/regions/", u"mwg-rs")
exempi.register_namespace("http://ns.adobe.com/xap/1.0/sType/Dimensions#", u"stDim")
exempi.register_namespace("http://http://ns.adobe.com/xmp/sType/Area#", u"stArea")
mwg_rs_ns = exempi.prefix_namespace_uri(u"mwg-rs")
starea_ns = exempi.prefix_namespace_uri(u"stArea")

xmp = exempi.new_empty()
exempi.append_array_item(xmp, mwg_rs_ns, "RegionList", consts.XMP_PROP_VALUE_IS_ARRAY, "", 0)
exempi.set_property_float(xmp, starea_ns, "x", 0.5, 0)

options = consts.XMP_SERIAL_OPTIONS['omit_packet_wrapper']
output = exempi.serialize_and_format(xmp, options, 0, '\n', ' ', 0)

output

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Exempi + XMP Core 5.6.0">
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
    xmlns:mwg-rs="http://www.metadataworkinggroup.com/schemas/regions/"
    xmlns:stArea="http://http://ns.adobe.com/xmp/sType/Area#">
   <mwg-rs:RegionList>
    <rdf:Bag>
     <rdf:li/>
    </rdf:Bag>
   </mwg-rs:RegionList>
   <stArea:x>0.500000</stArea:x>
  </rdf:Description>
 </rdf:RDF>
</x:xmpmeta>

Simple image region samples

python-xmp-toolkit / python-xmp-toolkit

how to use MWG Tags #74